Odd recurring pain

Over the past year or so I've noticed a trend that will happen with me

It has happened about 9-10 times now that after I take ibuprofen for whatever purpose, headache, soreness, etc - roughly 15-20 minutes later, my entire lower back and ribs will start to feel like they are being crushed in a trash compactor. Kind of like a constant held spasm. The pain is very intense and makes it difficult to breathe, and no matter how i position myself it doesn't alleviate at all. It always lasts 5-10 minutes, then subsides as quickly as it came on.

Obviously the main deal is probably "take something else for a headache" - but has anyone had this happen to them? What the fuck is this? Do I have aids?